Way back around 1972-3 saw together John Wayne in the Cowboys (released jan 1972) with another film at a summer camp dude ranch.

Movie started, a woman is walking out of a parking garage in Manhattan and gets hit in the head by a snowball…in July! By some kind of acquaintance or ex, whom then stalks her the rest of the flick. Climax of the movie is six months later during Christmastime, the stalker is on top of the ornate sloped roof of an older skyscraper (maybe the Helmsley Building) he falls, but grabs a string of christmas lights, hangs off the side of the building, eventually falls to is death.